RE: high energy gammas?

["Bob Hearn" <rah@america.net>]

While trying to develop on-line reactor monitoring techniques during the
early 1970's with a small Ge(Li) detector and NaI detector crawling around
in the bowels of the GTRR (heavy-water moderated, high enriched fuel, 5 MWt
continuous research reactor at Georgia Tech - now decommissioned) to
investigate cover gas streams and other sources, I encountered a very
significant shine from the process room giving me a distinct N-16 spectrum
from 8.87 MeV gammas and associated escape peaks. (Nitrogen shine has been
more commonly referenced for BWR power reactor operations.)

Bob Hearn
rah@america.net

-----Original Message-----
From: radsafe@romulus.ehs.uiuc.edu
[mailto:radsafe@romulus.ehs.uiuc.edu]On Behalf Of Lieskovsky, Miro
Sent: Tuesday, August 22, 2000 12:54 PM
To: Multiple recipients of list
Subject: high energy gammas?


Dear Radsafers:

I looked into the higher energy HP Ge spectra (< ~8MeV) collected around
'active' systems of a nuclear plant and found the following peaks that I can
not associate with nuclides:

1) 7633 keV (+- ~2.0 keV) with its Single Escape @ 7122 keV and Double
Escape @ 6611 keV
2) 7647 keV (+- ~2.0 keV) with SE @ 7136 keV and DE @ 6625 keV

Additionally;
the following peaks @ ~7864 and 7978 keV were present; these are likely the
DE ones, however, since the system gain was only up to approximately 8000
keV. I can not confirm.  If true then the full energy gamma lines would be @
approximately 8886 and 9000.

The above peaks do not appear to be due to the summation effect.

Any help will be greatly appreciated.  Thank you in advance.

Miroslav Lieskovský
Health Physicist
NB POWER - PLGS
P.O. BOX 600
Lepreau, N.B.
Canada, E5J 2S6
Tel. (506) 659 7421
Fax. (506) 659 6981
mailto:mlieskovsky@nbpower.com
http://www.nbpower.com









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